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| Content Provider | PubMed Central |
|---|---|
| Author | Levin, Jacquelyn Friedlander, Sheila Fallon Rosso, James Q. Del |
| Abstract | This three-part review presents what is currently known about the involvement and interdependency of the barrier properties of the epidermis, especially the stratum corneum and various specific immunological responses in the etiopathogenesis of atopic dermatitis. Part 1 of this review depicts the role of filaggrin in atopic dermatitis while Part 2 (which will be published in an upcoming issue of The Journal of Clinical and Aesthetic Dermatology) evaluates the role of serine proteases and specific lipids in the structural and functional integrity of the stratum corneum and related barrier functions in atopic dermatitis. Filaggrin is a key component of the stratum corneum that is derived from a larger precursor protein and contributes to its physical strength, hydration status, skin pH, and buffering capacity among other physiochemical properties. Filaggrin gene loss of function mutations appear to play a pathophysiological role; however, they are not the sole pathogenic factor in atopic dermatitis. Adverse structural changes of the stratum corneum are caused by upregulation of serine proteases activity, which causes degradation of certain stratum corneum proteins that are integral to barrier functions; interference with the formation of the stratum corneum intercellular lipid membrane, which normally regulates epidermal water flux and gradient; and induction of a TH2 pattern of inflammation, which is characteristic of atopic skin. Alteration in lipid ratios and changes in lipid-directed enzymes may play a role in the impairment of epidermal barrier functions that are associated with atopic dermatitis. Part 3 of this review (which will be published in an upcoming issue of The Journal of Clinical and Aesthetic Dermatology) discusses how immune dysregulation, including upregulation of a TH2 inflammation pattern, augmented allergic sensitization, sustained wound healing inflammation, and impaired innate immunity all play a role in the development of atopic dermatitis. An increased understanding of the interdependence, polymorphisms, and dysregulations of epidermal barrier functions, including the stratum corneum permeability barrier, immune response barrier, and antimicrobial barrier, should provide further knowledge about the pathophysiological mechanisms that are related to the development of atopic dermatitis, are clinically relevant, and can better direct researchers to develop therapies that are targeted at important pathogenic components of the disease state. |
| Starting Page | 16 |
| File Format | |
| ISSN | 19412789 |
| Journal | The Journal of Clinical and Aesthetic Dermatology |
| Issue Number | 10 |
| Volume Number | 6 |
| Language | English |
| Publisher | Matrix Medical Communications |
| Publisher Date | 2013-10-01 |
| Access Restriction | Open |
| Rights Holder | Matrix Medical Communications |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Dermatology |
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